[PATCH v1 1/2] scsi: ufs: Fix up clock scaling

* [PATCH v1 1/2] scsi: ufs: Fix up clock scaling
       [not found] <1572351831-30373-1-git-send-email-cang@codeaurora.org>
@ 2019-10-29 12:23 ` Can Guo
  2019-10-31  7:04   ` kbuild test robot
  2019-10-31  7:04   ` [RFC PATCH] scsi: ufs: ufshcd_scale_clks() can be static kbuild test robot
  2019-10-29 12:23 ` [PATCH v1 2/2] scsi: ufs: Do not rely on prefetched data Can Guo
  1 sibling, 2 replies; 5+ messages in thread
From: Can Guo @ 2019-10-29 12:23 UTC (permalink / raw)
  To: asutoshd, nguyenb, rnayak, linux-scsi, kernel-team, saravanak,
	salyzyn, cang
  Cc: Subhash Jadavani, Alim Akhtar, Avri Altman, Pedro Sousa,
	James E.J. Bottomley, Martin K. Petersen, Stanley Chu, Bean Huo,
	Tomas Winkler, open list

From: Subhash Jadavani <subhashj@codeaurora.org>

In host reset and restore path, after hba is stopped but before it is
enabled back again, we scale up clocks to their max frequencies.
If clock scale notify vendor specific ops happens to have any operations
to hba, DME commands for example, it would fail due to hba is stopped at
this moment. This change introduces another func to explicitly set clock
frequency so that it can be used here and also in ufshcd_scale_clks().
Meanwhile, this change modifies the clock scaling preparation error out
path so that clock is released before it returns.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
---
 drivers/scsi/ufs/ufshcd.c | 74 +++++++++++++++++++++++++++++++----------------
 1 file changed, 49 insertions(+), 25 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index c28c144..3a0b99b 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -903,28 +903,29 @@ static bool ufshcd_is_unipro_pa_params_tuning_req(struct ufs_hba *hba)
 		return false;
 }
 
-static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
+/**
+ * ufshcd_set_clk_freq - set UFS controller clock frequencies
+ * @hba: per adapter instance
+ * @scale_up: If True, set max possible frequency othewise set low frequency
+ *
+ * Returns 0 if successful
+ * Returns < 0 for any other errors
+ */
+static int ufshcd_set_clk_freq(struct ufs_hba *hba, bool scale_up)
 {
 	int ret = 0;
 	struct ufs_clk_info *clki;
 	struct list_head *head = &hba->clk_list_head;
-	ktime_t start = ktime_get();
-	bool clk_state_changed = false;
 
 	if (list_empty(head))
 		goto out;
 
-	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, PRE_CHANGE);
-	if (ret)
-		return ret;
-
 	list_for_each_entry(clki, head, list) {
 		if (!IS_ERR_OR_NULL(clki->clk)) {
 			if (scale_up && clki->max_freq) {
 				if (clki->curr_freq == clki->max_freq)
 					continue;
 
-				clk_state_changed = true;
 				ret = clk_set_rate(clki->clk, clki->max_freq);
 				if (ret) {
 					dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
@@ -943,7 +944,6 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
 				if (clki->curr_freq == clki->min_freq)
 					continue;
 
-				clk_state_changed = true;
 				ret = clk_set_rate(clki->clk, clki->min_freq);
 				if (ret) {
 					dev_err(hba->dev, "%s: %s clk set rate(%dHz) failed, %d\n",
@@ -962,13 +962,36 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
 				clki->name, clk_get_rate(clki->clk));
 	}
 
+out:
+	return ret;
+}
+
+/**
+ * ufshcd_scale_clks - scale up or scale down UFS controller clocks
+ * @hba: per adapter instance
+ * @scale_up: True if scaling up and false if scaling down
+ *
+ * Returns 0 if successful
+ * Returns < 0 for any other errors
+ */
+int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up)
+{
+	int ret = 0;
+
+	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, PRE_CHANGE);
+	if (ret)
+		return ret;
+
+	ret = ufshcd_set_clk_freq(hba, scale_up);
+	if (ret)
+		return ret;
+
 	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, POST_CHANGE);
+	if (ret) {
+		ufshcd_set_clk_freq(hba, !scale_up);
+		return ret;
+	}
 
-out:
-	if (clk_state_changed)
-		trace_ufshcd_profile_clk_scaling(dev_name(hba->dev),
-			(scale_up ? "up" : "down"),
-			ktime_to_us(ktime_sub(ktime_get(), start)), ret);
 	return ret;
 }
 
@@ -1154,35 +1177,36 @@ static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up)
 
 	ret = ufshcd_clock_scaling_prepare(hba);
 	if (ret)
-		return ret;
+		goto out;
 
 	/* scale down the gear before scaling down clocks */
 	if (!scale_up) {
 		ret = ufshcd_scale_gear(hba, false);
 		if (ret)
-			goto out;
+			goto clk_scaling_unprepare;
 	}
 
 	ret = ufshcd_scale_clks(hba, scale_up);
-	if (ret) {
-		if (!scale_up)
-			ufshcd_scale_gear(hba, true);
-		goto out;
-	}
+	if (ret)
+		goto scale_up_gear;
 
 	/* scale up the gear after scaling up clocks */
 	if (scale_up) {
 		ret = ufshcd_scale_gear(hba, true);
 		if (ret) {
 			ufshcd_scale_clks(hba, false);
-			goto out;
+			goto clk_scaling_unprepare;
 		}
 	}
 
-	ret = ufshcd_vops_clk_scale_notify(hba, scale_up, POST_CHANGE);
+	goto clk_scaling_unprepare;
 
-out:
+scale_up_gear:
+	if (!scale_up)
+		ufshcd_scale_gear(hba, true);
+clk_scaling_unprepare:
 	ufshcd_clock_scaling_unprepare(hba);
+out:
 	ufshcd_release(hba);
 	return ret;
 }
@@ -6207,7 +6231,7 @@ static int ufshcd_host_reset_and_restore(struct ufs_hba *hba)
 	spin_unlock_irqrestore(hba->host->host_lock, flags);
 
 	/* scale up clocks to max frequency before full reinitialization */
-	ufshcd_scale_clks(hba, true);
+	ufshcd_set_clk_freq(hba, true);
 
 	err = ufshcd_hba_enable(hba);
 	if (err)
-- 
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